NASA scrubs Wednesday's launch of the space shuttle Discovery due to a faulty fuel-tank sensor. The space agency did not immediately set a new launch date. The decision came with less than 2 1/2 hours left in the countdown.
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Award-winning journalist Richard Harris has reported on a wide range of topics in science, medicine and the environment since he joined NPR in 1986. In early 2014, his focus shifted from an emphasis on climate change and the environment to biomedical research.